Floyd said the test showed no damage, and he's ready to resume practice whenever the Vikings' coaching and medical staff gives him the OK.

"No worries on my part," he said. "At the end of the day, it's (coach Leslie Frazier's) call, not mine."

Floyd's left knee was still sore early Sunday after the first-round draft pick out of Florida was injured in the second quarter of a 27-13 preseason loss to Houston on Friday night.

So Frazier said the team decided Floyd would have an MRI to make sure there wasn't any damage.

"Not overly concerned by everything I have been told," Frazier said before the test. "It's just sore, so we want to err on the side of caution."

Floyd was hit low from behind in the second quarter and did not return. He was on the field for Sunday's morning walk-through and the afternoon padded practice, but did not participate.

"I knew it was OK right after it happened," he said. "I knew there was no problem."

Frazier said he liked what he saw before Floyd got injured, including a tackle for a loss and a deflected pass against the Texans.

Also Sunday, cornerbacks A.J. Jefferson and Xavier Rhodes and free-agent linebacker Desmond Bishop returned to afternoon practice after all were sidelined with hamstring injuries.

Defensive tackle Christian Ballard (groin) and linebacker Audie Cole (ankle) did not practice. Frazier said cornerback Jacob Lacey will have arthroscopic surgery on his knee and likely be out 2-4 weeks.